Compound Ingots
Bulk single-crystal compound semiconductor ingots including GaAs, InP, SiC, and Sapphire for epitaxial wafer manufacturing and device fabrication. Available in select types with full characterization data and traceability.
The Compound Semiconductor Ingot Market
Compound semiconductor ingots represent a fundamentally different class of materials than silicon — binary, ternary, and quaternary crystals engineered for properties that silicon cannot achieve: direct bandgaps for light emission and detection, wide bandgaps for high-voltage and high-temperature operation, and electron mobilities 6–20× higher than silicon for millimeter-wave and sub-terahertz frequencies. The global compound semiconductor substrate market exceeded USD 4 billion in annual revenue, driven by 5G infrastructure deployment, electric vehicle electrification, AI data center optical interconnects, and advanced sensing technologies.
Unlike the silicon industry — where 300mm CZ ingots are a commodity — compound semiconductor ingot production is characterized by smaller diameters (2″–8″), proprietary growth technologies (VGF, LEC, PVT, Kyropoulos), longer cycle times, lower yields, and dramatically higher value per kilogram. A single 6″ SI-GaAs VGF ingot can command over USD 10,000, while a high-quality 200mm 4H-SiC boule represents an even more significant investment. For device manufacturers and epi-wafer foundries, the quality, consistency, and traceability of the bulk ingot are the primary determinants of downstream epitaxial yield and device performance.
At GINECHIP, we source and supply compound semiconductor ingots from qualified crystal growth partners worldwide. Each ingot is provided with full characterization data — including HR-XRD, EPD, Hall effect, GDMS, and surface metrology — plus unique ingot ID, growth run history, and seed lineage traceability. Whether you need SI-GaAs for smartphone PAs, InP for 800G coherent transceivers, 200mm SiC for EV power modules, or large-diameter sapphire for Micro-LED displays, our compound semiconductor team can match your specification to the optimal supplier and manage logistics, customs, and compliance.
GaAs (Gallium Arsenide) Ingots
Gallium arsenide is the most commercially mature compound semiconductor after silicon, with a direct bandgap of 1.42 eV and electron mobility approximately 6× higher than silicon (8,500 vs 1,400 cm²/V·s). GaAs substrates are the workhorse of the RF and optoelectronic industries, enabling cell phone power amplifiers, 5G mmWave front-end modules, 940nm VCSELs for facial recognition, and 850nm photodetectors for fiber-optic datacom links.
Growth Methods
VGF (Vertical Gradient Freeze)
The preferred growth method for high-volume GaAs ingot production. A seed crystal is placed at the bottom of a sealed crucible, and a precisely controlled thermal gradient is moved vertically through the melt. VGF produces ingots with extremely low dislocation density (EPD ＜ 500/cm² for 4″ SI-GaAs) and excellent radial uniformity. Modern multi-zone VGF furnaces can grow 6″ diameter ingots up to 300mm in length. This is the dominant method for smartphone PA and VCSEL substrate supply.
LEC (Liquid-Encapsulated Czochralski)
High-pressure Czochralski growth under a B₂O₃ encapsulant layer to prevent arsenic dissociation from the melt. LEC produces GaAs ingots with higher throughput than VGF but typically higher EPD (10³–10⁴/cm²). Historically dominant, LEC remains relevant for conductive (N-type, P-type) GaAs substrates used in LEDs and lower-cost optoelectronic devices where ultra-low EPD is not required.
InP (Indium Phosphide) Ingots
Indium phosphide is the premier compound semiconductor for photonic integrated circuits (PICs) operating in the 1.3–1.55μm telecommunications window. With a direct bandgap of 1.34 eV and the unique ability to lattice-match quaternary InGaAsP alloys spanning the entire fiber-optic low-loss and zero-dispersion wavelength ranges, InP is irreplaceable for high-speed fiber-optic transceivers, tunable lasers, electro-absorption modulators, and photodetectors operating at 100G/400G/800G data rates.
Growth Methods
VGF (Vertical Gradient Freeze)
The leading method for high-quality InP ingot production. Multi-zone VGF furnaces with phosphorus overpressure control produce 2″–4″ diameter SI-InP and N-type InP ingots with EPD ＜ 5×10⁴/cm². VGF provides superior radial uniformity compared to LEC, critical for epi-ready substrates used in laser and PIC manufacturing. Typical ingot length: 150–200mm.
LEC (Liquid-Encapsulated Czochralski)
High-pressure LEC under B₂O₃ encapsulant. Historically the standard for InP production. Higher throughput than VGF but typically higher EPD (5×10⁴–10⁵/cm²). Remains used for lower-cost InP substrates where dislocation density is less critical, such as certain photodetector applications.
SiC (Silicon Carbide) Ingots
Silicon carbide is the wide-bandgap semiconductor driving the electric vehicle revolution. With a bandgap of 3.26 eV (4H-SiC), critical breakdown field 10× higher than silicon, and thermal conductivity exceeding copper, SiC power devices (MOSFETs, Schottky diodes) enable EV traction inverters, onboard chargers, and DC-DC converters with dramatically lower switching losses and higher operating temperatures than silicon IGBTs. The global SiC substrate market is experiencing a historic transition from 150mm (6″) to 200mm (8″) diameter to meet the cost-per-die reduction demands of automotive OEMs.
Growth Methods
PVT (Physical Vapor Transport)
SiC powder is sublimated at 2,200–2,500°C in an inductively heated graphite crucible and re-condenses on a seed crystal maintained at a slightly lower temperature. This is the only commercially viable method for bulk SiC ingot production. Growth rates are very slow (~0.1–0.5 mm/hour), and ingot thickness is typically limited to 25–50mm. Controlling polytype (4H vs 6H), micropipe density (target: ＜ 0.1/cm²), and basal plane dislocation density is the central challenge of SiC crystal growth.
Sapphire (Al₂O₃) Ingots
Single-crystal sapphire (α-Al₂O₃) is the dominant substrate for gallium nitride (GaN) LED epitaxy, accounting for over 80% of all LED substrates. With a hexagonal crystal structure, excellent optical transparency from UV to mid-IR, high thermal stability (melting point 2,050°C), and chemical inertness, sapphire provides an ideal heteroepitaxial template for GaN-based blue, green, and white LEDs. Beyond LEDs, sapphire ingots supply substrates for silicon-on-sapphire (SOS) RFICs, scratch-resistant watch crystals, and high-durability optical windows for aerospace and defense applications.
Growth Methods
Kyropoulos (KY)
The dominant method for large-diameter sapphire ingots (up to 12″/300mm). A seed crystal is dipped into molten Al₂O₃ and slowly withdrawn while the melt temperature is reduced. Produces low-stress, low-dislocation ingots ideal for C-plane LED substrates. Typical boule weights exceed 100 kg. The slow cooling process (~1 week) ensures minimal thermal stress and excellent crystal quality.
EFG (Edge-Defined Film-Fed Growth)
Produces sapphire in near-net-shape ribbons, tubes, or rods rather than boules. Particularly suited for specialty geometries (sapphire tubes for high-temperature processing, ribbon substrates for SOS). Higher growth rates than Kyropoulos but limited cross-sections.
HEM (Heat Exchanger Method)
Directional solidification in a controlled thermal gradient. Produces large sapphire boules (up to 500mm diameter) with very low bubble content. Particularly suited for aerospace optical windows and large-area substrates. HEM ingots can exceed 150 kg in weight.
Yield & Slicing Economics
Slicing compound semiconductor ingots into epi-ready wafers involves significantly higher costs per wafer than silicon, driven by smaller diameters, harder materials (SiC is second only to diamond in hardness), and lower yields due to higher defect densities. Understanding the total cost of ownership (TCO) from ingot to epi-ready wafer is critical for supply chain planning.
GaAs / InP
Wire saw slicing with 180–250μm kerf loss. Post-sawing CMP is mandatory for epi-ready surfaces. Typical overall yield from ingot to epi-ready wafer: 55–70% for 4″ GaAs VGF. InP yield is lower (~45–60%) due to brittleness and cleaving propensity during wafering.
SiC
Diamond wire saw slicing with 200–350μm kerf loss. SiC hardness (Mohs 9.5) makes slicing the most expensive step. Laser slicing and cold-split technologies are emerging to reduce kerf loss. Epi-ready CMP yield: 40–60% for 150mm 4H-SiC.
Sapphire
Diamond wire saw slicing with 250–400μm kerf loss. Kyropoulos boules up to 100+ kg enable economies of scale. Post-sawing CMP for LED epi-ready surfaces. Overall yield from boule to epi-ready wafer: 65–80% for 4″ C-plane.
Bulk Ordering & Lead Times
Compound semiconductor ingots are not commodities — each ingot represents weeks to months of precisely controlled crystal growth. Lead times vary significantly by material, diameter, and specification:
| Material | Typical Lead Time | MOQ | Growth Cycle |
|---|---|---|---|
| GaAs (VGF, 4″–6″) | 8–12 weeks | 1 ingot | 3–5 days per ingot |
| InP (VGF, 2″–4″) | 10–14 weeks | 1 ingot | 3–4 days per ingot |
| SiC (PVT, 6″–8″) | 16–24 weeks | 1 boule | 5–10 days per boule |
| Sapphire (KY, 4″–12″) | 6–10 weeks | 1 boule | 7–14 days per boule |
Expedited orders may be accommodated at premium pricing depending on furnace availability and existing production schedules. GINECHIP maintains relationships with multiple qualified crystal growth partners to offer the best combination of lead time, quality, and price for your specification.
Custom Doping Requirements
Many compound semiconductor applications require non-standard doping levels, compensation ratios, or co-doping strategies. GINECHIP's crystal growth partners can accommodate the following custom doping requests:
GaAs
Si, Te, Sn (N-type); Zn, C (P-type); Cr, Fe, EL2 (semi-insulating). Carbon doping for HBT base layers. Low-EPD SI-GaAs with precisely controlled EL2 concentration for RF switch substrates.
InP
S, Sn, Se (N-type); Zn (P-type); Fe (SI-InP). Fe-doped SI-InP with resistivity ＞ 10⁷ Ω·cm for high-speed photonic IC substrates. S-doped N-type InP with controlled carrier concentration for laser structures.
SiC
N (N-type), Al (P-type), V (semi-insulating). Nitrogen doping for 4H-SiC power MOSFET drift layers. Vanadium-compensated SI-SiC for GaN-on-SiC RF HEMT substrates. Custom resistivity profiles per epitaxial requirements.
Applications & Market Segments
RF & Wireless Communications
GaAs HBT and pHEMT epi-ready substrates for smartphone PAs, 5G mmWave beamforming ICs, WiFi 6E/7 front-end modules, and satellite communication transceivers. InP substrates enable sub-terahertz (D-band, 110–170 GHz) transistors for 6G research.
Optical Communications
InP photonic integrated circuits for 100G/400G/800G coherent transceivers, tunable lasers, electro-absorption modulated lasers (EMLs), and semiconductor optical amplifiers (SOAs). The backbone of AI data center optical interconnects.
Electric Vehicle Power
SiC MOSFETs and Schottky barrier diodes on 4H-SiC substrates for 800V traction inverters, onboard chargers, and DC fast-charging infrastructure. 200mm SiC transition reducing die cost by 30–40% for automotive OEM volume targets.
LED & Display
GaN-on-sapphire blue/green LED epi-wafers for general lighting, automotive headlamps, horticultural lighting, and Micro-LED displays. Sapphire substrates represent a multi-billion unit annual market driven by solid-state lighting adoption.
3D Sensing & LiDAR
GaAs VCSEL arrays for smartphone facial recognition (structured light, ToF), automotive LiDAR, and industrial 3D sensing. Short-cavity 940nm VCSELs require extremely uniform, low-EPD GaAs substrates for multi-junction high-power arrays.
Aerospace & Defense
GaAs and GaN-on-SiC MMICs for radar, electronic warfare, and satellite communications. Sapphire optical windows for IR seekers and multispectral sensors. SiC substrates for radiation-hard power electronics in space applications.
Industrial Power
SiC power modules for motor drives, renewable energy inverters (solar, wind), UPS systems, and rail traction. SiC devices enable higher switching frequencies, reduced cooling requirements, and smaller form factors compared to silicon IGBTs.
Research & Emerging
Custom-doped compound semiconductor ingots for university and corporate R&D: dilute nitride GaInNAs solar cells, InP quantum cascade lasers, SiC quantum sensors, GaAs photonic crystal cavities, and emerging Ga₂O₃ and AlN bulk substrates.
Quality Certification & Traceability
Every compound semiconductor ingot from GINECHIP is delivered with a comprehensive Certificate of Analysis (CoA) and full traceability documentation. This is essential for ISO 9001 / IATF 16949 compliant manufacturing, epi-wafer foundry qualification, and device reliability certification.
Technical Specifications
| Parameter | Available Range / Values |
|---|---|
| GaAs Ingots | VGF/LEC, 2″ – 6″ diameter, SI / N-type / P-type, EPD ＜ 5×10³/cm², up to 300mm length |
| InP Ingots | VGF/LEC, 2″ – 4″ diameter, N-type SI available, EPD ＜ 5×10⁴/cm², up to 200mm length |
| SiC Ingots | PVT, 4″ – 8″ diameter, 4H-SiC & 6H-SiC, N-type & SI, MPD ＜ 1/cm², up to 50mm thickness |
| Sapphire Ingots | Kyropoulos / EFG / HEM, 2″ – 12″ diameter, C/R/A-plane, bubble-free, up to 500mm length |
| Doping Level | Per material specification and customer requirement |
| Crystal Orientation | On-axis or off-axis per specification |
| Surface | As-grown, ground, oriented flats/notches |
| Quality Documentation | Full CoA including XRD, EPD, resistivity mapping for each ingot |
| Traceability | Unique ingot ID, growth run history, seed lineage |
| Packaging | Custom crate with vibration isolation, nitrogen-purged container for hygroscopic materials (InP) |
| Compliance | SEMI Standards, RoHS, REACH, Conflict Minerals |
Need Compound Semiconductor Ingots?
Specify your material (GaAs, InP, SiC, Sapphire), diameter, doping type, resistivity range, orientation, and quantity — our compound semiconductor specialists will identify the optimal supplier, provide full CoA specifications, and deliver a detailed quotation with lead time within 48 hours.